Tamping-roller



M. M. EMERSON.

TAMPING ROLLER.

APPLICATION FILED 1uN 23. 1920.

1,371,303. y Patented Mar. 15,1921.

3 SHEETS-SHEET 2.

/N VEN TUH A TTORNE YS M. M. EMERSON.

TAMFING ROLLER. APPIICATION FILED JUNE 23. 1920.

Patented Mar. 15, 1921.

3 SHEETS-SHEET 3.

l/VVE/VTH M AISNE/R504.

WIM/588% W kf- UNITED STATES PATENT OFFICE.

MOSES MANCIL EMERSON, OF ELLENSBURG, WASHINGTON.

TAMPING-ROLLER.

VApplication led `Tune 23,

To aN yzr/lom it may conce-rn.'

Be it known that I. Moses M. EMERSON, a citizen of the United States, and a resident of Ellensburg, in the county of Kittitas, and State of lVashngton, have invented certain new and useful Improvements 1n Tamping-Rollers, of which the following is a specification.

My invention relates to improvements 1n tamping rollers. l

The object of the invention isto provide an improved tamping roller which will be effective to completely tamp and roll the entire surface being acted upon and which is of simple and durable construction, reliable and efficient in operation, and easy and inexpensive to manufacture. u

Other objects and advantages of the 1nvention reside in certain novel features of construction, combination and arrangement of parts which will be hereinafter more fully described and particularly pointed out in the appended claims, reference being had to the accompanying drawings forining part of this specification, and 1n which:

Figure 1 is a transverse vertical section of the tamping roller;

Fig. 2 is a side elevational view of one of the tamping units;

Fig. 3 is a longitudinal section of a tamping unit;

Fig. 4 is an elevational view of the periphery or tread of the tamping unit;

Fig 5 is a detail perspective view of the detachable traction element.

Referring to the drawings it will be seen that my invention contemplates a tamping roller comprising a roller shaft upon which is rotatably mounted a plurality Of tamping units, indicated generally at 11.

Each of the tamping units includes a hub designated generally at 12, and rotatably mounted upon the roller shaft. The hub consists of a pair of spaced bearing plates 13 one of which is provided with an annular flange 1/1 extending between the bearing plates and parallel to the axis of the roller shaft. This aniuilar flange serves to space the bearing plates and being disposed adjacent the inner ends thereofl it defines an inner cavity 15 and outer cavity 16. Means is provided for securing the bearing plates of each hub together, and this means preferably comprises a lurality or a circular series of bolts 17 which extend through the bearing plates and the annular flange 14 and Specification of Letters Patent.

Patented Mar. 15, 1921.

1920. serial No. 391,252.

which have their heads 18 countersunk into the outer surface of the bearing plates.

A circular series of roller bearings 19 are received and retained in the inner cavity 15 and are thus interposed between the hub and the roller shaft.

A tamping element 20 is slidably mounted in the outer cavity 16. This tamping element is freely rotatable and is freely slidable but all of its sliding movement is constrained to take place along radial lines so that it is slidable radially and only radially. The tamping element consists of a disk 21 having an annular bearing portion at its inner periphery which slidably engages the bearing plates and having in its outer periphery an annular enlargement 23. This enlargement may, if it is desired to lighten the tamping element, be provided with an annular cavity 24.

The tread surface of each tamping element is provided with a plurality of traction elements 25 which as seen in Fig. 4 are arranged circumferentially in a pair of parallel transverse rows, the traction units of one row being staggered or arranged alternately with respect to the tract-ion units of the other` row. As shown in detail in Fig. 6, each of the traction elements is provided with a shoe 27 constructed of cast steel or chilled iron. Each of these shoes is provided with a shouldered socket 28 which receives the unit 25 and which is riveted thereto by means of rivet pins 29.

Means are provided for retaining thetamping units in position on the roller shaft. This means comprise a pair of end plates 30 mounted on the end of the roller shaft and secured in position by lock pins 31.

1n operation it will be understood that as the tainping roller is pulled along the tamping units will partake independently of rotary movement on the roller shaft. The hubs carrying the tamping elements being easily and freely rotatable by virtue of the roller bearing interposed between these bearings andv the roller shafts. Moreover the taniping units themselves may partakel of rotary motion with respect to the hubs and they are freely and independently adapted to slide radially in the bearing cavity 16 of the hub. rThis slidable movement of the tamping element however is -at all times constrained to take place along radial lines. This is an important feature of the invention in that it provides for the llt proper contacting of the tamping units with the ground and that it insures freedom and independence as between the units, because of the fact that the units are at all times freely spaced from each other. T his motion of the tampin units occurs 1n addition to or along witli the motion of the hub which rotating on the roller shaft and traveling forwardly described or traverses a cycloid path.

I claim: v

l. In a tamping roller of the character described, a shaft, a plurality of tamping units on said shaft, each of said units comprising a hub rotatably mounted on sa1d shaft and consisting of a pair of spaced bea-ring plates, one of said bearing plates havin an annular flange extending between the p ates adjacent the inner end thereof and defining an inner and an outer cavity, means extending through said flange to secure said plates together, roller bearings received in said inner cavity and interposed between the hub and the shaft, a tamping disk having an annular bearing portion at its inner periphery received 1n the outer cavity for rotary and radial sl1d1ng movement with respect to said hub and havin an annular enlargement at its outer en traction elements carried by the tread of said disks, removable traction shoes arranged upon said traction elements, and means for retaining said tamping umts on said shaft.

2. In a tamping roller of the character described, a shaft, a plurality of tamping units on said shaft, each of said units comprising a hub rotatably mounted on said shaft and consisting of 'a pair of spaced bearing plates, one of said bearln plates having an annular flange extending etween the plates adjacent the inner ends thereof and defining an inner and an outer cavity, means extending through said flange to secure said plates together, roller bearings received in said inner cavity and interposed between the hub and the shaft, a tamping element for rotary and radial sliding movement in said outer cavity, and means for retaining said tamping unit on said shaft.

3. In a tamping roller of the character described, a shaft, a plurality of tamping units on said shaft, each of said units comprising a hub rotatably mounted on said shaft and consisting of a pair of spaced bearing plates, one of said bearing plates havin an annular flange extending between the pites adjacent the inner ends thereof and defining an inner and anv outer cavity,

means extending through said flange to secure said plates together, roller bearings received in said inner cavity and interposed between the hub and the shaft, and a tamping element for rotary and radial sliding movement in said outer cavity.

4. In a tamping roller of the character described, a shaft, a plurality of tamping units on said shaft, each of said units comprising a hub rotatably mounted on said shaft and consisting of a pair of spaced bearing plates, one of said bearing plates having an annular flange extending between the plates adjacent the inner ends thereof and defining an inner and an outer cavity, roller bearings received in said inner cavity and inter osed between the hub and the shaft, an a tamping element for rotary and radial sliding movement in said outer cavity.

5. In a tamping unit of the character described, a shaft, a plurality of tamping units-on said shaft, each of said units comprising a hub rotatably mounted on said shaft and consisting of a pair of spaced bearing plates, means for securing said plates together in spaced relation, a tamping disk received for rotary and radial sliding motion between said bearing plates and means for retaining said tamping units on said shaft.

6. In a tamping roller of the character described, a shaft, and a tamping unit on said shaft including a hub rotatably mounted thereon and consisting of a pair of spaced bearing plates, one of said bearing plates' having an annular flange extending be- -tween the plates adjacent the inner ends thereof and defining an innerand an outer cavity, means extending through said flange to secure said plates together, roller bearings received in said inner cavity and interposed between the hub and the shaft, and a tamping disk received for rotary and radial slidin movement in the outer cavity.

7. l a tamping roller of the character described, a shaft, a tamping unit on sa1d shaft including a hub consisting of spaced bearing plates and a tamping disk received between said bearing plates for rotary and sliding movements with lrespect thereto.

8. In a tamping unit of the character described, a shaft, a plurality of tamping units on said shaft, each of said units comprising a hub and a tamping disk received by said hub for rotary and radial sliding movement with respect thereto, and means for securing said tam in units on said shaft.

- MOgE MANCIL EMERSON. 

